buckingham



1 and the running stone rotated with a true GRINDING-MILL,

Specificationof Letters Patent No.

To all whomftt may concern:

Be it known that I, C. P; BUGKINGHAM, ofMount Vernon, in the county of Knox and State of Ohio, have invented a new and Improved Grinding-Mill; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- 1 a Figure 1, is a vertical central section of my invention. Fig. 2, is a horizontal section of ditto, taken in the linew, as, Fig. 1. Fig. 3, is a detached inverted plan of the cap of the lower stone. i

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to an improved mode of hanging the stones substantially as hereinafter described, whereby the same may be readily adjusted and due provision made for the escape of foreign substances which may chance to pass between them,

or even motion.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents a framing which may be constructed in any proper way to support the working parts of the mill.

B, represents the lower and C, the upper stone. The lower stone B, is fitted within a metal cap D, the center of which at its under side is fitted on the point of an upright rod B, the lower end of which is stepped in a bridge-tree F, and rests on a spring a, of india-rubber or other suitable material. The upper edge of the cap D, has a fianch 6, around it, said flanch projecting over a bed G, in the framing. From two opposite points of the fianch 6, pins 0, 0, project and fit in vertical grooves d, d, in the sides of the framing. The bridge-tree F, is attached or adjusted by a screw rod 6, and thumb nut f, as shown plainly in Fig. 1. In the framing A, and directly below the metal cap D, horizontal bars g, are secured and to these bars four elastic bars h, are attached at such point as to hear at equal distances apart against the cap D, and serve to prevent the lower stone from acquiring a vibratory motion while the mill is running;

H is a metal frame-work secured on the STATES PATENTOF o. P. BUoKINGHAM, orj iouxr vERNoNjon o 7 26,332, dated upper part of the framingA, andhavin hollow spindle \I fitted within itgpT is spindle I, is sustained in its bearingsv bya collar 2 which isi fittedl inya groove: made j I H circumferential-11y in the hub ij, of-{a driving? pulley J, on the spindle I, f-the hub; j,bei11g i1.

secured to the spindle bywa screw; [The i collar 2', has two journals Z, projectingfrom it at opposite points, and these journals are thefulcrum of which;: is atm. Throughrthei. L, passes The lower end of the hollow spindle Lhas outer end of the lever frame K, a screw rod 1 a circular .flanch M,-iattached which flancli 7Q is turned accurately and is fitted within a 1 ring N, secured concentrically and perma-g nently to the upper surface of ametal cap 0, i

in which the upper stone or runner C is secured. The fianch M, is exactly equal n 7 than the flanch.

edge, the notches 0,correspondingf tome: 1 size of the projections n. In the ring N, a i

key 72, is fitted or placed, said key project ing into one of the notches o, and locking the spindle I, and cap 0, together. 011. the ring N springs g, are secured the inner ends; f: i. of which are fitted in a groover, at the inner if part of the flanch M.

From the above description it will bejseen a that as the spindle I, is rotated the motion will be communicated to the cap O, and 1 stone C, and the latter on account of its peculiar connection with thespindle, will be rotated with an even true motion and if1the95 runner G, be thrown up atone sideiby the If passage of anyflarge foreign substance between the stones, it will gently d o 1 ,1 1; its proper position without any wabbhng or 1;

vibratory motion which would be iproducedf of by the ordinary modes; of hanging the stones. The difference between the thickness of the u ring N, and flanch allows of the upward yielding movement of thestone C, and the prings 9, cause the stone Q, to adjust itself promptly to its proper position whenremoved therefrom by. the passage of large a foreign substances between them.

The lower stone B, is stationary of course,

that is to say,does notrotate, butin 001138.

quence of beingbala-nced, and supported wholly on the upper pointed end of the rod E, it can tip to one side and assist in letting obstructions pass between the stones and escape; while the action of the spring bars h, in clasping the stone with a moderate pressure, will prevent, by their friction, the vibration which is apt to ensue, after it has been tipped to one side, and still permit the vertical motion of the said lower stone in its adjustment by means of the bridge tree F. The rod E, is accurately fitted into a hole through the middle bar g, which guides it in its vertical motion, and keeps the center of gravity of the lower stone always in the line of the axis of the spindle; It will be seen from the drawing that either stone may be adjusted to grind fine or course by means of the respective screw rods L, and e.

The spindle I, may be readily detached from the cap 0, of the upper stone or runner by removing the key p, and turning the spindle until the notches 0, register wlt-h the projections n. The grain or substance to be ground is fed down through the hollow 25 the metal cap 0, of therunner C said ring 35 being provided with projections n which shall permit a rocking motion of the stone upon the spindle, and a kep p or its equivalent, substantially as andrfor the purposes set forth. 1 .7

2. The use in connection with the bed stone B of the elastic bars h for the purpose specified.

0. P. BUCKINGHAM.

WVitnesses E. CALKINs,

J WHITE. 

